42results about How to "Enhanced Raman effect" patented technology

The disclosure, in one aspect, provides a method for estimating a property of a fluid that includes: pumping an ultraviolet (UV) light into a fluid withdrawn from a formation downhole at a wavelength that produces light due to the Raman effect at wavelengths that are shorter than the substantial wavelengths of fluorescent light produced from the fluid; detecting a spectrum corresponding to the Raman effect light (“Raman spectrum”); and processing the detected Raman spectrum at one or more selected wavelengths to estimate a property of the fluid. In another aspect, the disclosure provides an apparatus that includes a laser that induces UV light at a selected wavelength into a fluid in a chamber, a detector that detects Raman scattered light at wavelengths shorter than the wavelengths of the fluorescent light scattered by the fluid, and a processor that analyzes a spectrum corresponding the Raman scattered light at a selected wavelength to estimate a property of the fluid.

The invention provides a graphene oxide-silver nanoparticle-titanium dioxide nanotube array material which comprises a titanium dioxide nanotube array, silver nanoparticles and graphene oxide layers, wherein the silver nanoparticles are deposited on the surface of a pipe orifice of the titanium dioxide nanotube array and are evenly distributed; the graphene oxide layers are respectively deposited on the surfaces of the silver nanoparticles and are respectively of a single-layer structure. The invention also provides a preparation method of the graphene oxide-silver nanoparticle-titanium dioxide nanotube array material and an application of the graphene oxide-silver nanoparticle-titanium dioxide nanotube array material as a surface-enhanced Raman scattering substrate. According to the graphene oxide-silver nanoparticle-titanium dioxide nanotube array material, the silver nanoparticles with an electromagnetic field enhancement effect and graphene oxide with a chemical enhancement effect and an interface adsorption effect are sequentially deposited onto the titanium dioxide nanotube array with photocatalytic activity, and the obtained material has a Raman enhancement effect and a photocatalytic self-cleaning function, can be taken as the surface-enhanced Raman scattering active substrate and is applied to the high sensitivity detection and the circulation detection of organic matter.

The invention discloses a mercury ion detection reagent and a detection method. The reagent comprises nano sol, nucleic acid adaptors marked by Raman active molecules and a charge modifier. The detection method comprises the following steps of: firstly, synthesizing the nano sol, then adding a proper quantity of adaptors to a proper quantity of fresh nano sol and uniformly mixing; continuing to add a proper quantity of charge modifier and uniformly mixing; then adding a sample to be tested and incubating for 1-5 minutes; and finally, taking the nano sol to test a Roman scattering spectral signal and carrying out data processing. In the invention, based on the addition of Hg<2+>, the structures of the nano particle surface nucleic acid adaptors are changed, i.e. nano particle aggregation in the silver sol and surface enhanced Roman scattering signals of signal molecules are enhanced. In the invention, the SERS (Surface Enhanced Raman Scattering) technology is adopted, the detection limit to the Hg<2+> is at the nmol/L level, thus the invention has the advantages of high detection speed of the linear response range of Hg<2+> concentration and high selectivity and is suitable for the quick detection of trace Hg<2+> in environmental water.

The invention discloses a ZnO-Ag surface enhanced Raman scattering substrate and detection of organic pollutants with the substrate. The preparation method for the substrate comprises the following steps: the first step, ITO conductive glass is subjected to ultrasonic cleaning with acetone, alcohol and deionized water one by one and dried in the air; the second step, organic additives are added in a zinc nitrate solution, a first mixed liquid is formed, after the first mixed liquid is stirred for 30 min, an ammonia-water solution with a mass fraction of 25% is dropwisely added in the first mixed liquid, a second mixed liquid is formed, the processed ITO conductive glass from the first step is soaked in the second mixed liquid, after the water bath is at a constant temperature, the ITO conductive glass is placed in a baking box and baked for 60-100 min, a white and uniform ZnO layer is formed on the surface of the ITO conductive glass; the third step, Ag nanoparticles are deposited on the prepared ZnO nanolayer from the second step, and a ZnO-Ag surface enhanced Raman scattering substrate is obtained. The preparation method is simple. The prepared substrate has high sensitivity and good stability and can be used repeatedly.

The invention discloses a preparation method and application of a silicon-based spiny nanocone ordered array. The preparation method comprises the steps: preparing a tightly-arranged single-layer ordered PS sphere array on a silicon wafer substrate; heating the single-layer ordered PS sphere array on the silicon wafer substrate; then, carrying out etching by using a reactive ion etching method, and regulating an etching current at least once in the etching process; and then, after finishing the etching, removing the single-layer ordered PS sphere array on the silicon wafer substrate to preparethe silicon-based spiny nanocone ordered array. A layer of gold film is deposited on the surface of the silicon-based spiny nanocone ordered array serving as a template by using a physical depositionmethod to prepare a silicon-based spiny nanocone ordered array on which the gold film is deposited, and the silicon-based spiny nanocone ordered array can be directly used as a substrate material with surface-enhanced Raman effect. The preparation method is simple, convenient to operate, low in cost, economic and environment-friendly; and the prepared silicon-based spiny nanocone ordered array islarge in structure area, good in uniformity, clean in surface, high in sensitivity and good in detection property.

The invention discloses a portable surface-en hanced Raman spectrometer and a measuring method thereof. A Raman signal is generated by Raman measurement of a light path; the microstructure of the surface of a sample is obtained by a white light path, and light path focus situation is determined; the surface of the sample is enabled to be right at the position of the focus of a microobjective by moving a three-dimensional platform, the surface of the sample can be clearly imaged and is the best position for laser focus, the strongest Raman signal is acquired, and the best effect to stimulate and collect the Raman signal is achieved. Raman measurement is performed by assist of an SERS (surface enhanced Raman Scattering) substrate which is specifically designed and is good in surface enhancement effect and high in uniformity by the aid of the surface enhance Raman effect, the Raman signal is enhanced to a great extent, and measurement efficiency and measure flexibility are improved; traceelements can be analyzed in the field rapidly, the application range of the portable Raman spectroscopy technology is broadened, and feasibility is provided for rapid and accurate measurement of thetrace components in the field.

The invention discloses a gold film covered high-density nano needle point array and application thereof. A preparation method of the gold film covered high-density nano needle point array comprises the following steps: preparing a glass substrate single-layer polystyrene colloidal crystal array; etching the glass substrate single-layer polystyrene colloidal crystal array by a reactive ion etching method; removing the single-layer polystyrene colloidal crystal array from the glass substrate to obtain a high-density nano needle point array; with the high-density nano needle point array as a template, depositing a layer of gold film with thickness of 10-50nm on the surface of the template by a physical deposition method to obtain a gold film covered high-density nano needle point array. The gold film covered high-density nano needle point array can be directly used as a substrate material of a surface-enhanced Raman scattering effect. The gold film covered high-density nano needle point array disclosed by the invention has the advantages of large structural area, high uniformity, clean surface and high detection sensitivity; moreover, the preparation method is simple and convenient to operate, low in cost and economical and environment-friendly.

The invention is applicable to the technical field of biology, and provides a Raman homogeneous detection method for recognizing a binding antigen by using an antibody, which comprises the following steps: preparing silver nanoparticles by using a sodium citrate reduction method, and coupling the antibody and Raman reporter molecules to the surfaces of the silver nanoparticles and magnetic nanoparticles by using an EDC/NHS activator to obtain the Raman homogeneous detection method, preparing two Raman probes for targeting target antigens; and detecting a specific antigen by using a Raman probe. The detection method disclosed by the invention is based on a pair of Raman probes of an immune sandwich method, and the two probes are provided with antibodies combined with a target antigen. The two probes can be combined with a target antigen to form an immune complex, so that the surface enhanced Raman effect is excited, and the target antigen is detected. According to the method, the solid-phase connection mode of the antibody on the surfaces of the nanoparticles is improved, so that the detection efficiency of the probe is improved. The detection method has a wide application prospect.

The invention relates to a Raman gas analyzing device of column vector field excited hollow core photonic crystal fiber. The prior art has defects of complex structure, low sensitivity and high structural requirement. According to the invention, the surface-enhanced Raman effect and the hollow core photonic crystal fiber technology are combined, and the device is based on the gas Raman analysis principle. A detected gas flows through hollow cavity of hollow core photonic crystal fiber, and a surface-enhanced Raman structural layer is arranged at the inner side of the hollow cavity of the hollow core photonic crystal fiber; by a column vector filed, one end of the fiber is coupled into the hollow core photonic crystal to realize Raman excitation, a photoelectric detection part detects a Raman scattering signal, and analysis is carried out to obtain matter character information of the detected gas. The device provided by the invention has characteristics of low dosage of the detected gas, high sensitivity, high signal to noise ratio, strong resistance to interference, low positioning requirement, easily constructed system, easy miniaturization, strong analysis and discrimination capability, wide application range, easily expanded function and the like.

The invention relates to the technical field of surface enhanced Raman scattering active substrates, in particular to an Au-Au dimer array structure and a preparation method and application thereof. The invention discloses an Au-Au dimer array structure, which comprises a substrate and an Au-Au columnar dimer structure arranged on the substrate in an array; the Au-Au dimer array structure is characterized by comprising first gold particles, a silicon dioxide interlayer and second gold particles, wherein the three parts sequentially extend upwards from the substrate. When the Au-Au dimer arraystructure is used for an SERS substrate, a Raman signal is stable, and the repeatability is good; adjacent particles generate coupling of localized surface plasmas, so that plasma resonance is enhanced; and a stronger SERS effect is generated by being compared with single particles.

The invention relates to a method of ultrafast detection of antibiotic substances by combined voltage driven solid phase microextraction-raman spectroscopy. The method comprises the following steps: taking a nano golden particle wrapped porous silver wire as a working electrode, a saturated calomel electrode as a reference electrode and a platinum electrode as a counter electrode to form an electrode system, putting the electrode system in a water sample to be detected, applying -0.05 to -0.2V voltage to the electrodes, quickly enriching the antibiotic substances in the water sample onto the working electrode due to voltage driving to achieve in-situ solid phase microextraction, and performing exciting irradiation on the surface of the working electrode through a raman spectrometer for raman spectroscopy. The method increases a diffusion rate of the substances to be detected in the water sample; the nano golden particle wrapped porous silver wire is specific to the antibiotic substances, so that the antibiotic substances are enriched onto the working electrode directionally selectively; the enrichment detection speed is greatly increased; and actual applications in quick field detection and water sample pollutant surveillance are achieved.

The invention discloses a single-molecule detection method based on dynamic Raman spectrum and relates to a dynamic Raman spectrometry method. The method comprises the following specific steps: modifying a molecule to be measured with a Raman signal at the tip; establishing a single-molecule Raman signal detection system; when a sample is irradiated by excitation light, generating the Raman signal, and detecting interaction between molecules by dynamically detecting change of the Raman spectrum; and adjusting bias voltage on a gold electrode, and monitoring change in intensity of the peaks at1003 cm <-1> and 1027 cm <-1> to control the interaction between molecules. The method can change the distance of metal-metal nano-gap by adjusting the bias voltage to regulate the weak interaction between the molecules, and can modify different signal molecules on the gold electrode and nanoparticles to study interaction between different molecules; and the method is wide in application range, high in function, visual in data and simple to operate.

The invention discloses a groove composite multi-bulge structure and a preparation process thereof. The groove composite multi-bulge structure provided by the invention comprises a substrate, the semiconductor device further comprises a plurality of grooves arranged on the substrate, wherein the substrate is provided with a groove, the protrusions are compounded on the surface of the groove, the transverse size of the top of the groove is smaller than or equal to 1 micrometer, at least 1*105 grooves are formed in the substrate per square millimeter, the number of the protrusions compounded onthe surface of each groove is larger than or equal to 40, and the transverse size of the end, close to the surface of the groove, of each protrusion is larger than or equal to 60 nanometers. The SERSsubstrate is very novel in structure, and has high light absorption capacity and high SERS activity.

The invention discloses a preparation method of a surface-enhanced Raman sensor based on a metal organic framework structure. The surface-enhanced Raman sensor is prepared from a rod-like Ag-MOF material with silver as a metal coordination ion and 2-aminoterephthalic acid as a ligand. During preparation, the material is uniformly coated on the surface of a substrate, silver ions are reduced into relatively uniform silver elementary substance particles through high-temperature carbonization reduction, and organic matters are carbonized, so that interference of functional groups in a Raman spectrum of the surface-enhanced Raman sensor in a low-wave-number section is removed, and the surface-enhanced Raman sensor has a good surface-enhanced Raman sensing effect. The preparation process of the sensor is simple, the cost is low, the advantage of a uniform grid structure of the MOF material is exerted, the distance between silver particles is fixed, and the sensor has a good surface enhanced Raman effect, high sensitivity and small background interference signals and can be used for low-concentration detection of various organic matters in water.

The invention relates to a functionalized micro-channel plate. The functionalized micro-channel plate is characterized in that a plurality of oblique up-down transparent micro-holes parallel to one another are arrayed in the micro-channel plate, and metal nanorod arrays are attached to the insides of the micro-holes. A biomolecular sensor is characterized by comprising a signal amplification device, an energy conversion device and a recognition device, wherein the signal amplification device is used for realizing the concentration detection of trace markers (concentration: -fg/mL) and even single molecules by virtue of the micro-channel plate; and the metal nanorod arrays are prepared in the micro-channel plate, and biological markers are detected by virtue of a Raman spectrum based on surface plasmon resonance of the metal nanorod arrays in the micro-holes of the micro-channel plate.

The invention belongs to the technical field of preparation of precious metal and semiconductor heterogeneous materials, and particularly relates to an Ag-AgX nanowire and a preparation method thereof. The preparation method comprises the following steps: (1) mixing a soluble silver source, a surfactant A and a surfactant B (or halide salt) in a certain molar ratio, dissolving the mixture in water, carrying out uniform stirring, and then carrying out heating and reacting for a certain time; and (2) centrifugally washing the reaction liquid obtained by the reaction to obtain a product. The Ag-AgX uniform-size nanowire with simple and adjustable anions is prepared by a one-step hydrothermal method, and the method is simple and convenient in operation process, low in cost, good in repeatability and high in practicability; the invention further provides a uniform-size one-dimensional Ag-AgX nanowire or nanorod synthesized by the preparation method, and the composite heterogeneous material has potential application value in the fields of catalysis, photocatalysis, biosensing detection and electronic devices.

The invention discloses a preparation method of an SERS substrate based on a novel composite material. The preparation method comprises the following steps: S1, synthesizing Au@Ag NPs with a core-shell structure; S2, synthesizing Ag NPs; S3, synthesizing Ag NPs@CoNi-LDH; S4, synthesizing AgNPs@CoNi-LDH@GO: dispersing the Ag NPs@CoNi-LDH prepared in step S3 into ethanol, adding 2 mg/mL of graphene oxide dispersion liquid, heating the mixed solution in a water bath at 60 DEG C, violently stirring for 2 hours, centrifuging, collecting precipitate, washing with ethanol, and re-dispersing in ethanol to obtain ethanol dispersion liquid of the Ag NPs@CoNi-LDH@GO; and S5, preparing the SERS substrate: dispensing the Au@Ag NPs ethanol dispersion liquid prepared in step S1 on a mold, performing air drying, dispensing a layer of Ag NPs@CoNi-LDH@GO ethanol dispersion liquid prepared in step S4, and taking down the mold after natural air drying, thereby obtaining the SERS substrate. The SERS substrate prepared by the preparation method is high in adsorption capacity and can be used for simultaneously and rapidly detecting dimethyl sulfide and 2, 4-di-tert-butylphenol.

The invention discloses an active cavity traveling wave field enhanced gas Raman detection device. The device comprises a high-precision cavity, a detected gas chamber, a Raman light field collection part, a photoelectric detector and an analysis unit for collecting and analyzing Raman signals. According to the active cavity traveling wave field enhanced gas Raman detection device disclosed by the invention, an active laser resonant cavity mechanism is adopted, and a traveling wave light field and detected gas molecules interact so that a light field in a detected area has a relatively good uniformity characteristic, and the detection reliability and the anti-interference capability are enhanced; the active light field can interact with detected gas molecules in two directions in the two-way propagation process, the photon density of the light field in the cavity is high, the interaction effect is further improved through a two-way effect, gas Raman signals are improved, cavity-enhanced gas Raman detection is achieved, the gas Raman effect can be further remarkably improved, high-sensitivity gas Raman detection is realized, and maintenance brings a better use prospect.